How do blood types influence Japanese culture?
In Japan, blood types are commonly used to predict personality and relationship compatibility.
This cultural belief, called 'ketsueki-gata,' suggests that blood groups dictate temperament. Type A people are often seen as perfectionists, while Type B individuals are viewed as creative rebels. Although it lacks scientific proof, the concept influences dating, job recruitment, and even video game character design.
Nerd Mode
The Japanese obsession with blood types began in 1927 when psychologist Takeji Furukawa published 'The Study of Temperament Through Blood Type.' He observed personality patterns in his students and proposed that the four ABO blood groups corresponded to specific behavioral traits. While his research was later dismissed by the scientific community for lacking empirical evidence, the idea was revived in the 1970s by Masahiko Nomi, a journalist with no medical background.Nomi's book, 'Understanding Affinity by Blood Type,' became a massive bestseller and solidified the concept in Japanese pop culture. Today, the theory posits that Type As are earnest and sensitive, Type Bs are passionate and individualistic, Type ABs are rational and controlled, and Type Os are optimistic and strong-willed. This belief is so pervasive that it has led to 'bura-hara,' a term for blood type-based harassment or discrimination in the workplace.Despite numerous studies, including a 2014 report by Akira Kanazawa that analyzed over 10,000 people, no significant correlation has ever been found between blood antigens and personality. Modern scientists explain the phenomenon through the 'Barnum Effect,' where individuals believe vague personality descriptions apply specifically to them. Nevertheless, Japanese media continues to utilize blood types in horoscopes and marketing to cater to this deeply rooted cultural tradition.
Verified Fact
FP-0004607 · Feb 19, 2026